I understand that Clean Install is typically the way to go for the smoothest transition to a new OS, but Im wondering if its really necessary for my rMBP. I just got it this week and I havent really done much with it since I was waiting for Mountain Lion to launch. When I say, havent really done much, Im referring to not doing any installations of software and applications, setting up email, adding photos/videos, etc.. I thought by keeping it default as possible that the upgrade path would be just fine. Is that the case? I will appreciate all responses with your opinions and/or recommendations. Also, if I were to go with the Clean Install route, can someone please give me step-by-step instructions as to how I can wipe my SSD to do an Internet Recovery of the ML OS? I booted with Command+R and went to disk utilities, but thats where I get lost. I dont know what to wipe I see the SSD and other sub sections that I dont know what to erase. Thanks in advance guys/gals!